Goldy, to start off, read Nambroth's big FAQ , the link is down in my signature.
If your flock had been vaccinated, I think that I would be looking for other possibilities. Not to say it's not Marek's, but seems like any info on Marek's is either "unlikely" highly unlikely, or "highly likely", there are no definite answers.
If your flock had been vaccinated, I think that I would be looking for other possibilities. Not to say it's not Marek's, but seems like any info on Marek's is either "unlikely" highly unlikely, or "highly likely", there are no definite answers.